Perlit ilavesinin kalsiyum alüminat çimentosu pastalarının dayanımının gelişimine ve termal stabilitesine etkisi.

Calcium aluminate cement is a special cement that reaches high strength in a short time but suffers a considerable loss of strength due to moisture and temperature-related conversion of metastable calcium aluminum hydrates. The study aimed to produce stratlingite as a stable hydration product to completely stop or reduce this chemical conversion using an inexpensive and abundant silica source. Ground perlite was chosen as the source of silica. Perlite was mixed with calcium aluminate cement in different proportions and two different water-to-binder ratios. The paste and mortar samples obtained were cured under different temperature and humidity conditions. Na2SO4 and Ca(OH)2 were also added in small quantities to these mixtures to investigate their influence on strength development and hydrated phases at early ages. A strength loss is observed in the pure cement samples due to conversion, after 20-30d for the dry-cured samples but after only 2-3d for the wet-cured samples. The loss is small and slow (